Change-speed gear.



" PATENTED MAY 5 P. HESSELIUS.

CHANGE SPEED GEAR.

APILIOATIOH FILED MAR.5,1907.

2 SHEETS-SHEET 1.

PATENTED MAY 5, 1908. P. HESSBLIUS. CHANGE SPEED GEAR.

APPLIQATION FILED mm. 5, 1907.

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Unirn srar FEQE,

PETER HESSELIUS, OF CHICAGO, ILLINOIS.

CEANGE-SPEED GEAR.

no. ese,7o1.

Specification of Let-tom ?atent.

Patented Ma 5, mos.

Application filed. March 5, 1&7. Serial No. 360,651.

T 0 all whom it may. concern:

citizen of the United States, and a resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Chan e-Speed Gear; and I do hereby declare that ilie following is a full, clear, and 'exact description thereof,

accompanying reference being had to the drawings, and to the letters of reference marked thereon, which form a part of this specification.

ThlS invention relates to variable speed power. transmitting gears and more espe cially to a gear of that class'in which any one of a set of gear wheels rotatively mounted on a shaft and meshing with another set of gears fixed to a second shaft can be non-rotatlvely secured to its shaft for the purpose of transmitting power from one of said shafts to the other. I

My invention may be better understood by reference to. the accompanying drawings,"

in which,'

Figure 1 is a horizontal section of my improved gear, said section being taken on line 1-1 of Fig. 2. 2 is a vertical section on line 2-2 of Fi 1. Fig. 3 is an enlarged de tail section on ine 3-3 of Fig. 1. D Fig. 4 is a perspective view of the slotted bar included in my device. Fig.v 5 is a plan view showing my device with its elements arranged in a dilferent manner. Fig. 6 is a vertical section on line 66 of Fig. 5. Fig. 7 is an enlarged detail. section on the line 77 of Fig. 6. Fi 8 is a perspective view of the slotted In Figs. lto 4,'inclusive, I have shown a form of my im roved gear with itselements more especial y arranged to constitute a transmission gear for use in automobiles to transmit power from a longitudinal driving shaft to the rear wheels of the vehicle, and in Fig.1,1 is indicated in outline a differential,

gear of ordinar form which can besused in connection wit my device. Asshown in said Figs. 1 to 4, inclusive, A indicates a driving shaft mounted in hearings orjournals a a and B'indicates a driven shaft. Said driven shaft, as herein shown, may be either the jack-shaft of'an automobile, from the ends of which power is transmitted to the rear wheels by means of sprockets and chains in a familiar manner, or said shaft may be the'rotative shaft of a live rear axleof ordinary form. For either of said pur psets shaft B consists of two parts haw Be 1t known that l, "PETER HEssELIUs, a

mg their adjacent ends connected with a dif ferential. ear 0 of ordinary .form. ltigidly fixed to t e case of said differential gear is a so differential gear case, in the form of a sleeve surrounding the shaft B, is fixed abevel gear- D. The bevel gear Wheel D and the bevel gear D are arranged with their faces toward,

each other. 0n the driven shaft A are rota'- tively mounted four bevel pinions A A A 7Q; A of approximately equal diameter, the -eff first three of which mesh, respectively, with the bevel gears D D and D ,'and thefourth I with the bevel gear D 'cured a ainst longitudinal movement on the Said pinions are seshaft A y means of thrust collars a. Means are provided non-rotatively securing any a one of the pinions A A or A to its shaft in order to transmit rotary motion from said ihaft A to said shaft B in. varying ratios of so ngular velocity, and for non-.rotatively securingtho inion A to its shaft in 0rd rto transmit, t ough the bevel gear D, rotary otion 'to said shaft B in a reverse direction.

aid means comprises parts as follows: Each of the inions A, A", A A is provided in the inner ace of the bore of its hub with one or more radial notches a a adapted. to be engaged= b radially arranged, inwardlyand outward y movable keys c a mounted .on 9D the shaft A. Said keys, when retracted, rest Within radial'recesses in the shaft A. Each of said keys com rises a-fiat sided head fitting- Within aaralle sided groove in the shaft A and a cy indrical stem adapted to fit and B5 1 slide in a round hole drilled radially into the shaft. Each of said keys is pressed outward by two coiled springs c of, acting under compression. Over the outer ends of said keys is a longitudinally arranged bar E, fitting 10d within a longitudinal recess which entends along the side of the shaft A, which bar Y serves to press the keys radially inward against the action of their Said bar E is provided near one end with a longitude ct e of the proper length to allow one of.

nal s the keys to ro ect through the same when the bar is p seed in oosition with the slot over or in register witone ofthe key-s; and.

said bar can be slidlongitudinally in its re Hp cess along the shaft A in ordetcto bring the slot opposite either of said neys and. thereby permit any one of the keys to move out ward. Moreover, the end surfaces of the slot 0, and likewise the sides of the keys engaged by said end surfaces, are beveled or inclined so that longitudial movement of the bar E- will force inward any one-of the keys which may be projecting through the slot c. To one end of said bar E is fixed a shifting collar E having a circumferential groove eng'aged by'studs e c on a fork c of familiar construction.

From the foregoing it will be seen that by sliding the bar E into proper position to allow one of the keys to project through the.

slot 6, any one of the three pinions AA or A can be non-rotatively secured to its shaft, thereby transmitting motion through one of therespective gears D D or D to the shaft B. The different diameters of the gears D D and D provide three ratios of angular velocities between the two shafts. By locking the pinion A: upon its shaft motion can be transmitted through the gear D to the shaft B in a reverse direction.

In Figs. 5 to 8, inclusive, I have shown my device with three driving pinions A A and A rigidly fastened together by means of screws a and arranged in the form of a stepped cone, which is non-rotatively fixed to t e driving shaft A, and the four driven gears D D D and D rotatively mounted on the driven shaft B and adapted to be socured from rotation thereon by means of the keys (1, as above described. The two gears D and D meshing with the 'pinionA on diametrically opposite sides thereof are driven by said pinion A in opposite directions and provide means for reversing the direction of rotation ofthe driven shaft B. The difference in the ratios of the gears A and D, A and D and A and D provide three different ratios of angular velocities between the shafts A and B. Moreover, since my device is adapted for other uses besides use in an automobile, I have shown my said device in Figs. 5 to 8, inclusive, with the shaft B made in one piece and the driven gears 17 -1) 1) and D mounted directly thereon. without the interposition of a differential gear or any equivalent device.

I claim as my.-inventi'on:-

1. In a variable speed power transmitting .device, the combination with a driving shaft,

and'a driven shaft, of means for im arting rotationfrom said driving shaft to sai driven shaft, said means comprising a plurality of gear wheels mounted for separate rotation on one of said shafts andmeans for non-rota- Lively securing said go ar wheels to their shaft,

said latter means comprising a radial notch in the bore of each gear wheel, radially movable keys mounted in the shaft, and a longitudinally movable bar mounted in the shaft and rovided with a slot adapted toreceive said eys.

seer/oi In a variable speed power transmitting device, the combination with a driving shaft and a driven shaft, of means for imparting rotation from said driving shaft to said driven shaft, said means comprising a plurality of gear wheels mounted for separate ro-.

tation on one of said shafts, and means for non-rotatively securing said gear wheels to their shaft, said latter means comprising a radial notch in theboreof each gear wheel,

.. radially movable keys mounted on the shaft,

springs yieldingly pressing said keys outward, and e longitudinally movable bar mounted on said shaft and provided with a slot adapted to receive'said keys.

3. In a variable speed powertransmitting I device, the combination with a driving shaft and a driven shaft, of means for imparting rotation from said driving shaft to said driven-shaft, said "means com rising a plurality of gear wheels mounter for separate rotation on one of said shafts, and means for non-rotatively securing said gear wheels to said shaft embracing a movable s ring actuate keys, one for each gear wheel? a longitudinally arranged mov- (plurality of radially v able bar mounted to slide endwise on said shaft and provided with a slot adapted to be brought opposite either of said keys by the endwise movement of said bar.

4. In a variable speed power transmitting device, the combination-with a driving shaft and a driven shaft, of a plurality of means for imparting rotation from said driving shaft to said driven shaft, said means comprising gear-wheels mounted for separate rotation on one of said shafts, and means for nonrotatively securing the said gear wheels to the shaft embracing radially movable keys mounted on the shaft, springs a plied to press said keys outwardly, and a ongitudinally sliding bar mounted on the shaft and provided with a slot adapted for the passage of said keys, the ends of the slot'and the end faces of the keys being provided with beveled contact surfaces.

5. In a variable speed power transmitting device, the combination with a shaft provided with a longitudinal groove, and aplurality of gear wheels having radial notches in the bores of their hubs, of spring actuated keys movable radially in the shaft,-and alongitudinally movable barlocated in the said longitudinal groove of the shaft and pro vided with a slot for the passage of the said keys. 1

6. In a variable speed power transmitting device, the combinationwith a drivingshaft' and a driven shaft, of a bevel gear wheel mounted on one of said shafts, a bevel gear wheel intermeshing therewith and-rot'atively mounted on the other shaft, and means for non-rotatively securing said latter bevel gear wheel to and releasing it from its shaft, said means comprising a radial notch in the bore of said latter gear .wheel, a radially movable key mounted on the shaft, a spring yieldingly pressing said Hey outward, and a longitude nally movable bar mounted on said shaft and rovided with a slot adapted to receive said 7. In a variable speed power transmitting (l8\10, the combination with a driving shaft and a driven. shaft, of a plurality of bevel gear Wheels rotatively mounted on one of said shafts, radial notches in the bores of the hubs of said gear Wheels, s ring actuated keys movable radially in the s aft, a longitudinally sliding bar mounted on the shaft and provided with a slot adapted for the passage of said keys, and a bevel gear wheel mounted.

on the other of said shafts, said bevel gear wheel being provided with a plurality of} bevel gears adapted severally to intermesh with said first mentioned gear Wheels.

8. In a variable speed power transmitting device, the combination with a driving and a driven shaft, arran ed at an an le to each other, of a Wheel or isk mounted on one of said shafts and provided on its lateral face with a plurality of beveled gears, a plurality of beveled gear Wheels meshing therewith and loosely mounted on the other shaft, said gear Wheels being provided. With radial notches in the bores of their hubs, another beveled gear Wheel loosely mounted on the shaft carrying the loosely mounted gears, provided with a radialnotch in the bore of its hub and rotatively connected with the other shaft in a manner to im art rotation. to

as my invention I ailix my signature in the presence of two witnesses, this 27th day of- February A, D. 1907.

' PETER HESSELIUS.

f litnesses v W. L. HALL, 'i. H. Arranns. 

